162 INSECTS INJURIOUS TO VEGETATION. 



1. Tetrix ornata. Ornamented grouse-locust. 



Dark ash-colored ; a large white patch between four black 

 spots on the top of the thorax ; a white spot on the top of the 

 hind thighs; thorax nearly or quite as long as the wings. 

 Length |J- to -^^ inch to the apex of the thorax. 



This species varies in wanting the white spot on the top of 

 the thorax sometimes. It was first described by Mr. Say, 

 under the name of Acrydium ornatum* 



2. Tetrix dorsalis. Red-spotted grouse-locust. 



Rusty black, with ochre-yellow spots on the sides and legs, 

 and a large rust-red spot on the top of the thorax ; wings ex- 

 tending beyond the apex of the thorax. Length ^ inch. 



3. Tetrix quadrimaculata. Four-spotted grouse-locust. 



Ash-colored or dark gray above, variegated with black; four 

 velvet-black spots on the top of the thorax ; wings projecting 

 beyond the extremity of the thorax. Length from -z^-^ to ^^ of 

 an inch. 



This is a shorter and thicker species than the ornamented 

 grouse-locust. It is not uncommon in pastures from the first 

 of May to the first of June. 



4. Tetrix bilineata. Two-lined grouse-locust. 



Ash-colored; thorax paler, with a narrow angular whitish 

 line, on each side, extending from the head beyond the middle ; 

 the angular portion including a long blackish patch on each 

 side; wings, in the male, rather shorter than the thorax, in the 

 female longer. Length from gV ^o more than 2^^^ inch. 



5. Tetrix sordida. Sordid grouse-locust. 



Yellowish ash-colored; thorax with minute elevated black 

 points; wings, in both sexes, rather longer than the thorax. 

 Length from -^^ inch to nearly -|- inch. 



I have taken this species both in May and September, and 



* American Entomology. Vol. I. plate 5. 



